Seal plug



FIG. 1 is a perspective view of the front and top of a seal plugaccording to a first embodiment showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a perspective view of the front and top of a seal plugaccording to a second embodiment showing my new design;

FIG. 7 is a front view thereof;

FIG. 8 is a rear view thereof;

FIG. 9 is a top plan view thereof;

FIG. 10 is a bottom view thereof;

FIG. 11 is a right side view thereof; and,

FIG. 12 is a left side view thereof.

The ornamental design for a seal plug, as shown and described.